tính 51 - 6
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\(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{51}\\{\,\,6}\end{array}} \\\,\,\,45\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{46}\\{\,\,8}\end{array}} \\\,\,\,\,38\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{80}\\{\,\,3}\end{array}} \\\,\,\,\,77\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{51}\\{\,\,9}\end{array}} \\\,\,\,42\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{71}\\{\,\,2}\end{array}} \\\,\,\,69\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{36}\\{\,\,7}\end{array}} \\\,\,\,29\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{43}\\{\,\,8}\end{array}} \\\,\,\,\,35\end{array}\) | \(\begin{array}{l}\underline { - \begin{array}{*{20}{c}}{33}\\{\,\,4}\end{array}} \\\,\,\,29\end{array}\) |